Clavis-backed Alliance Tank Service acquires Willbros Tank as an add-on

Alliance Tank Service, a portfolio company of Clavis Capital Partners, has acquired Tulsa, Oklahoma-based Willbros Tank Services, a provider of storage tanks and related infrastructure. The seller was Willbros Group Inc. No financial terms were disclosed.


Dallas (January 2nd, 2018) – Clavis portfolio company Alliance Tank Service, LLC announced today the completion of the strategic acquisition of Willbros Tank Services from Houston-based Willbros Group Inc. (NYSE: WB). Terms of the transaction were not disclosed.

The acquisition of Willbros Tank is the first add-on acquisition for ATS under Clavis ownership and represents a significant extension of the Company’s capabilities in large storage tank construction, repair, maintenance and services. The expanded company will operate as ATS Group, LLC (dba Alliance Tank Service) and will have expanded offices in Cushing, OK; Tulsa, OK; and Channelview, TX.

Headquartered in Tulsa, Oklahoma, Willbros Tank has constructed storage tanks and related infrastructure for some of the most demanding and respected customers in the world for decades. The Company has a long and rich history of employing the industry’s most experienced and capable workforce and boasts one of the highest safety ratings in the industry. As a result of this acquisition, over 100 employees will join ATS, effective immediately.

Founded in 2008 and acquired by Clavis in 2016, Alliance Tank Services is a diversified liquid storage tank service provider that offers premium applications including field erected aboveground storage tank construction, tank repairs, engineering design, maintenance and consulting services. In addition, ATS manufacturers a variety of specialty shop tanks at its recently expanded state-of-the-art fabrication facility. To date, ATS has erected over 300 storage tanks for liquid feed, liquid fertilizer, asphalt, water, ethanol, and petroleum customers in more than 30 states.

About Clavis Capital Partners
Based in Dallas, Texas, Clavis Capital Partners is an operationally focused Private Equity firm that makes growth investments in manufacturing and industrial companies. Clavis professionals and advisors are experienced operators who are passionate about building sustainable, competitive and successful businesses. Clavis focuses on investments in under-resourced, lower to middle-market businesses with enterprise values ranging from $10 million to $200 million. More information can be found at